What do you have to do to find Arceus

catch every Pokemon posibble. (p.s youll have to trade and not evolve them, have them separate.) go to the Ruins of alf and then only have shaymin (sky forme) and go to where the uknown are and walk to the last statchue of ryhorn in the bottom part and click a, then y, then x, then b. finally, go to the lake of rage with shaymin (sky forme) and catch that arceus.